聚氨酯型阳离子交换膜的制备及其还原草酸中的应用  

Preparation of PU Cation-exchange Membrane and Its Application in Reducing Glycollic Acid

作　　者：江慧华[1,2] 马森 方继敏[2] 

机构地区：[1]福建省绿色化工技术重点实验室,武夷山354300 [2]武汉理工大学资源与环境工程学院,430070

出　　处：《聚氨酯工业》2011年第4期29-32,共4页Polyurethane Industry

基　　金：福建省教育厅B类科研项目(JB05191)

摘　　要：用六亚甲基二异氰酸酯(HDI)、聚酯多元醇、22,-二羟甲基丙酸(DMPA)和乙二胺为原料,采用阴离子自乳化法,制备了带有羧基活性官能团的聚氨酯(PU)乳液。将聚氨酯乳液流延在平置的玻璃上,室温下干燥,即可制得聚氨酯型阳离子交换膜。用聚氨酯型阳离子交换膜作为电解草酸还原为乙醇酸的电解槽隔膜。以电流密度、反应时间和温度做3因素3水平正交实验,得出最佳工艺条件为电流密度1200 A/m2、反应时间7 h、温度40℃。草酸的转化率达80.48%,电流效率均在79%以上。The polyurethane prepolymer was prepared with hexamethylene diisocyanate（HDI）,polyester polyol and dimethylol propinic acid（DMPA）.Then the prepolymer reacted with ethylenediamine extenders.The polyurethane emulsion was expanded in glass,drying at room temperature.Polyurethane（PU） cation-exchange membrane could be obtained.Glycollic acid was prepared via oxalic acid by PU cation-exchange membrane.By orthogonal experiments using current density,reaction time and temperature as three-factor two-level,the optimal operating conditions were obtained： current density was 1200A/m^2,reaction time was 7 h,temperature was 40 ℃.The oxalic acid conversion rate was 80.48% and current efficiency was over 79%.

关 键 词：聚氨酯型阳离子膜 草酸 乙醇酸 电化学还原 

分 类 号：TQ323.8[化学工程—合成树脂塑料工业]